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铝合金泡沫金属夹层板自冲铆接头力学性能研究
Study on mechanical properties of self-piercing riveting joints of aluminum alloy metal foam sandwich sheet
投稿时间: 2017-02-09  最后修改时间: 2017-03-13
DOI:
中文关键词:  自冲铆  泡沫金属  夹层板  力学性能  断口分析
英文关键词:self-piercing riveting  metal foam  sandwich sheet  mechanical properties  fracture analysis
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
刘洋 昆明理工大学机电工程学院 liuyangctgu@163.com 
何晓聪 昆明理工大学机电工程学院 625838121@qq.com 
赵得锁 昆明理工大学机电工程学院  
邢保英 昆明理工大学机电工程学院  
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中文摘要:
      对AA5052铝合金泡沫金属夹层板进行自冲铆接试验,对接头的可连接性进行探究,通过静力学试验对比各组接头的静力学性能,分析不同种类泡沫金属对自冲铆接头力学性能影响;用扫描电子显微镜对接头典型断口进行研究,分析其微观失效机理。结果表明:自冲铆技术可以实现泡沫金属夹层板的有效连接,接头具有良好的成形质量;泡沫金属夹层提高了自冲铆接头的静力学性能,其中泡沫镍夹层使AA5052自冲铆接头静失效载荷提高了4.1%;夹层板自冲铆接头失效形式均为铆钉与下板分离,其中泡沫铁镍夹层自冲铆接头下板铆扣断裂区域沾附在铆钉脚底部,为韧性断裂机制;下板内锁区域失效时铆钉与下板发生剧烈刮擦,呈现具有分层现象的片状组织。
英文摘要:
      The self-piercing riveting tests were performed to AA5052 aluminum alloy metal foam sandwich sheet to investigate the joint connectivity. Compared the static performance of joints through static tests, analysis of different types of metal foam on the mechanical properties of the self-piercing riveted(SPR) joints, adopting scanning electron microscope to observe the fracture surfaces of the joints, the failure mechanism of the joints was studied. The results show that: Self-piercing riveting can effectively realize the connection of metal foam sandwich sheets, the joints have good forming quality. The metal foam sandwich sheet improves the static performance of SPR joints, the nickel foam interlayer makes the static failure load of AA5052 SPR joint increased by 4.1%. The failure modes of SPR joints of sandwich sheet are the lower sheet separated. The fracture region of the lower sheet of SPR joint of iron-nickel foam sandwich sheet attached at the bottom of the rivet leg, it belongs to ductile fracture mechanism. The rivet and the lower sheet occur violently scratching in the lock area when the joint is failure, it presents lamellar structure and has delamination phenomenon.
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